healthy volunteer athletes and excluded those who had any of the following criteria: 1) counter-indications to magnetic resonance imaging (e.g., pregnancy or postsurgical hardware [plates, screws, aneurysm clip, implanted cardiac pacemaker, etc.]); (2) relevant medical problems (e.g., connective tissue problems, paralyzed hemidiaphragm, morbid obesity, claustrophobia, etc.); (3) clinical signs of an impairment or abnormality in the knee (e.g., abnormal range of motion, muscle weakness, or malalignment); (4) injury to the knee that required medical attention; (5) previous surgery on the knee; or (6) current pain in the knee.